Forage Pests Identification and Control. By Mir M Seyedbagheri University of Idaho, Elmore Extension
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1 Forage Pests Identification and Control By Mir M Seyedbagheri University of Idaho, Elmore Extension
2 Alfalfa Caterpillar: Larvae are velvety, green caterpillars up to 38 mm long. They have a narrow, white stripe on each side of the body through which runs a fine, pale red stripe. The larvae eat alfalfa leaves Adults are butterflies with yellow or white wings having a black border.
3 Army Cutworm: up to 40 mm long. It has a light brownish-gray head with pale brown spots. The body is pale grayish with white splotches and a browntinged top line. Alfalfa Looper: light to dark green ; about 35 mm long Adults are gray miller moths Host plants: cabbage, spinach, sugarbeets, peas, celery, potatoes, alfalfa, beans, ornamentals, mint.
4 Alfalfa Seed Chalcid Adults are tiny black wasps about 2 mm long. Larvae are white, legless, C-shaped grubs about 2 mm long. The female wasp lays eggs in alfalfa seed, and the larva consumes the inside of the seed.
5 Alfalfa Weevil: Newly hatched larvae are dingy yellow but soon become green with a shiny black head and prominent white stripe along the middle of the back. Adults feed on foliage. Larvae feed within leaf buds of the terminal growth and skeletonize leaves. Black Cutworm/Greasy Cutworm Mature larvae are pale gray to black caterpillars up to 40 mm long. Host plants: corn, sugarbeets, potatoes, beans, grasses, alfalfa.
6 Blue Alfalfa Aphid: bluish green and 3 to 3.5 mm long. It is generally abundant in early season or cooler weather Brown Wheat Mite: Dark mites, 1 mm long, with front legs longer than the body. Feeding injury causes a mottling of the leaves giving them a bronzed or yellow appearance. Host plants: peas, lentils, alfalfa, clover, wild legumes Host plants: cereals, onions, carrots, alfalfa, iris, gladiolus.
7 Clover Leaf Weevil: Larvae are green with a dark brown head and a white stripe down the back. Adults are brown, up to 10 mm long, and have a long snout. False Chinch Bugs: Adults are grayish-brown, narrow-bodied, and about 4 mm long. Nymphs are stubby, up to 3 mm long, gray, and with minute red markings. Host plants: alfalfa, clover, cereals, grasses, potatoes, sugarbeets, several weeds.
8 Clover Root Curculio A fat C-shaped larvae ; legless grubs about 5 to 6 mm long. They are white with a brown head. Adults are short, slender weevils 3 to 5 mm long with short, broad snouts. They are brownish-black and covered with grayish hair and scales.
9 English Grain Aphid: green, yellowish-green, red, or purple aphids are 2.5 to 3 mm long infest leaves early but suck sap from grain heads as soon as heads emerge European Earwig: Adults are 18 mm long. The body is reddishbrown and will skeletonize leaves
10 Lygus Bugs: Adult lygus bugs are 6 to 7 mm long Easily recognized marking is a yellowish, triangular-shaped area on top of the body at the base of the wings. Nuttall Blister Beetle: Adults are metallic green or purplish beetles; 16.5 to 28 mm long Host plants: alfalfa, corn, potatoes, beans, peas, onions, carrots, peppers, radishes, cereals, ornamentals.
11 Pea Aphid: a large aphid, about 3.5 to 4 mm long. Also a vector of several legume virus diseases Pea Leaf Weevil: Adults are grayishbrown, slender weevils about 5 mm long with a short snout. Can defoliate new-seeding alfalfa, causing stand loss or death Host plants: alfalfa, red clover, peas, lentils, vetch.
12 Spotted Alfalfa Aphid: 2 mm long, pale yellow, and has four to six rows of dark spots on its back. Its toxic saliva kills seedling plants Stinkbugs: Adults are green, gray, or brown; shield-shaped; and about 15 mm long. Host plants: alfalfa, beans, cow peas, cereals, peas, corn, fruits.
13 Two-spotted spidermite: eightlegged mites are lemon green in color and have a black spot on both sides of their bodies Western Flower Thrips: cigarshaped and around 2 mm long. Adults are tan, and nymphs are white. Host plants: alfalfa, beans, peas, sugarbeets, potatoes, ornamentals, fruit, cereals, corn. Host plants: beans, peas, corn, cereals, potatoes, alfalfa.
14 Western Yellowstriped Armyworm: 50 mm long with velvety black stripes on top and yellow stripes Wheat Stem Maggots: Adults are small flies, about 5 mm long, and light to dark green with a dark stripe on top of the thorax. Larvae are pale green maggots up to 6 mm long. Host plants: peas, beans, lentils, alfalfa, sugarbeets, potatoes.
15 Brought to you by University of Idaho Elmore Extension If you have any questions about this presentation or other publications, please call: Ext-509 Pasture Establishment presentations: Forage Harvest Management Pasture Soil Fertility
16 Recommended Websites 1. UC Davis.edu: Alfalfa Year-Round IPM Program; Annual Checklist University of Idaho Extension website, 2. Forage Crops and Pasture publications: =CROP%20PRODUCTION&category1=Crops&category2= Forage%20Crops%20and%20Pasture&color=91A967&fo nt=4b5f27
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